Grab a pre-gen Ninja 250, they're easily able to get 60+ MPG right out of the box with a stock tune.
Let her learn to ride and get used to controlling the bike before she starts getting into "other" ways to save fuel, but there's a guy on here who's able to get 100+MPG at times on his Ninja.
I rode mine like it was a super sport and still got ~65MPG with it even with the throttle pinned open almost 100% of the time.
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